How to NOT use default audio device on MAC

Same problem here – this is exactly what I complained about in this thread: How to fallback to the default audio device using AudioDeviceManager? . For me the fix was to remove this block of code from AudioDeviceManager::audioDeviceListChanged:

auto isCurrentDeviceStillAvailable = [&]
{
    for (auto* dt : availableDeviceTypes)
        if (currentAudioDevice->getTypeName() == dt->getTypeName())
            for (auto& dn : dt->getDeviceNames())
                if (currentAudioDevice->getName() == dn)
                    return true;

    return false;
};

if (! isCurrentDeviceStillAvailable())
{
    closeAudioDevice();

    std::unique_ptr<XmlElement> e (createStateXml());

    if (e == nullptr)
        initialiseDefault (preferredDeviceName, &currentSetup);
    else
        initialiseFromXML (*e, true, preferredDeviceName, &currentSetup);
}